lmdbal/table.cpp

// Squawk messenger. 
// Copyright (C) 2019  Yury Gubich <blue@macaw.me>
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "table.h"

DataBase::_Table::_Table(const std::string& p_name, DataBase* parent):
    dbi(),
    db(parent),
    name(p_name)
{
}

DataBase::_Table::~_Table() {}


void DataBase::_Table::drop()
{
    if (!db->opened) {
        throw Closed("drop", db->name, name);
    }

    MDB_txn *txn;
    int rc = mdb_txn_begin(db->environment, NULL, 0, &txn);
    if (rc) {
        throw Unknown(db->name, mdb_strerror(rc), name);
    }
    rc = drop(txn);
    if (rc) {
        throw Unknown(db->name, mdb_strerror(rc), name);
    }

    mdb_txn_commit(txn);
}

int DataBase::_Table::drop(MDB_txn* transaction)
{
    return mdb_drop(transaction, dbi, 0);
}

uint32_t DataBase::_Table::count() const
{
    if (!db->opened) {
        throw Closed("count", db->name, name);
    }

    MDB_txn *txn;
    MDB_stat stat;
    int rc = mdb_txn_begin(db->environment, NULL, 0, &txn);
    rc = mdb_stat(txn, dbi, &stat);
    if (rc) {
        throw Unknown(db->name, mdb_strerror(rc), name);
    }
    uint32_t amount = stat.ms_entries;
    mdb_txn_abort(txn);
    return amount;
}